Abstract: A three-dimensional numerical analysis model of fluid flow and heat transfer in pulsed current TIG weld pool is developed.According to the characteristics of transient, nonlinear,multiphase and strong coupling features bedtween the governing equations, a numerical simulatiou algorichm method is developed,which can evidently speed up the iterative convergence rate.The results of numerical simulation demonstrate the transient behavior of fluid flow field,temperature field and weld pool shape in pulsed current TIG welding process on the workpiece of 1Cr18Ni9Ti stainless steel. The bead-on-plate pulsed current TIG welding experiments show that the predicted results by the model introduced in this paper are in good agreement with the experimental ones.